I would be interested in hearing how other educational institutions deal with the fact that each iPad needs linking to an individuals iTunes account and credit card. In some departments they only have one iPad for the whole department so who's credit card details should we give Apple? As they are synced to an individuals iTunes account sharing these devices is proving difficult.
When we asked Apple if there was a way to buy apps on an institutional basis they suggested we go to PC World or similar and buy £100s or £1000s of iTunes gift cards.
As well as purchasing apps, connecting to iTunes and the wireless problems we previously experienced another problem we experience is the inability to open the keyboard for certain web forms including our own institutions collaborative sites for blogging and noticeboards.
Edit: Using on 3G when you are without a Wi-Fi signal is also troublesome. A lot of apps will not download over a 3G connection and a number of streaming services are also not supported over 3G. So if you are going to use one make sure you have good wireless coverage.
I have to add it is still a fabulous bit of hardware. The battery life, the noise it makes and the ease of use is excellent. I can certainly see why people will want to use them and using them in meetings is fantastic, so why won't Apple make it easier for educational and other institutions to manage them?